[libvirt] [PATCH v2 6/6] tools: make virt-host-validate check CPU vulnerabilities

Add a check reporting if any CPU vulnerabilities have not been mitigated by the kernel. It further reports whether it is safe to use Intel SMT for KVM guests or not, as several of the vulnerabilities are dangerous when combined with SMT and KVM, even if mitigations are in effect. eg on a host with mitigations, but unsafe SMT still enabled: Checking CPU hardware vulnerability mitigation...PASS Checking CPU hardware vulnerability SMT safety...FAIL Signed-off-by: Daniel P. Berrangé <berrange(a)redhat.com&gt; --- libvirt.spec.in | 1 + tools/Makefile.am | 1 + .../rules/linux-cpu-hardware-flaws.yaml | 165 ++++++++++++++++++ 3 files changed, 167 insertions(+) create mode 100644 tools/host-validate/rules/linux-cpu-hardware-flaws.yaml diff --git a/libvirt.spec.in b/libvirt.spec.in index f336296a08..8aa226798a 100644 --- a/libvirt.spec.in +++ b/libvirt.spec.in @@ -1901,6 +1901,7 @@ exit 0 %{_datadir}/libvirt/host-validate/linux-acpi.yaml %{_datadir}/libvirt/host-validate/linux-cgroups.yaml %{_datadir}/libvirt/host-validate/linux-cpu.yaml +%{_datadir}/libvirt/host-validate/linux-cpu-hardware-flaws.yaml %{_datadir}/libvirt/host-validate/linux-devices.yaml %{_datadir}/libvirt/host-validate/linux-iommu.yaml %{_datadir}/libvirt/host-validate/linux-namespaces.yaml diff --git a/tools/Makefile.am b/tools/Makefile.am index 728de475a2..907b0195c2 100644 --- a/tools/Makefile.am +++ b/tools/Makefile.am @@ -173,6 +173,7 @@ virt_host_validate_rules_DATA = \ $(srcdir)/host-validate/rules/linux-acpi.yaml \ $(srcdir)/host-validate/rules/linux-cgroups.yaml \ $(srcdir)/host-validate/rules/linux-cpu.yaml \ + $(srcdir)/host-validate/rules/linux-cpu-hardware-flaws.yaml \ $(srcdir)/host-validate/rules/linux-devices.yaml \ $(srcdir)/host-validate/rules/linux-iommu.yaml \ $(srcdir)/host-validate/rules/linux-namespaces.yaml \ diff --git a/tools/host-validate/rules/linux-cpu-hardware-flaws.yaml b/tools/host-validate/rules/linux-cpu-hardware-flaws.yaml new file mode 100644 index 0000000000..6a243df96d --- /dev/null +++ b/tools/host-validate/rules/linux-cpu-hardware-flaws.yaml @@ -0,0 +1,165 @@ +# +# Define facts related to CPU hardware vulnerabilities +# + +facts: +- name: cpu.vulnerability.meltdown + filter: + fact: + name: os.kernel + value: Linux + value: + file: + path: /sys/devices/system/cpu/vulnerabilities/meltdown + ignoreMissing: true + parse: + scalar: + regex: (\w+) + match: 1 +- name: cpu.vulnerability.spectre_v1 + filter: + fact: + name: os.kernel + value: Linux + value: + file: + path: /sys/devices/system/cpu/vulnerabilities/spectre_v1 + ignoreMissing: true + parse: + scalar: + regex: (\w+) + match: 1 +- name: cpu.vulnerability.spectre_v2 + filter: + fact: + name: os.kernel + value: Linux + value: + file: + path: /sys/devices/system/cpu/vulnerabilities/spectre_v2 + ignoreMissing: true + parse: + scalar: + regex: (\w+) + match: 1 +- name: cpu.vulnerability.spec_store_bypass + filter: + fact: + name: os.kernel + value: Linux + value: + file: + path: /sys/devices/system/cpu/vulnerabilities/spec_store_bypass + ignoreMissing: true + parse: + scalar: + regex: (\w+) + match: 1 +- name: cpu.vulnerability.mds + filter: + fact: + name: os.kernel + value: Linux + value: + file: + path: /sys/devices/system/cpu/vulnerabilities/mds + ignoreMissing: true + parse: + scalar: + regex: (\w+) + match: 1 +- name: cpu.vulnerability.mds_smt + filter: + fact: + name: os.kernel + value: Linux + value: + file: + path: /sys/devices/system/cpu/vulnerabilities/mds + ignoreMissing: true + parse: + scalar: + regex: SMT (\w+) + match: 1 +- name: cpu.vulnerability.l1tf + filter: + fact: + name: os.kernel + value: Linux + value: + file: + path: /sys/devices/system/cpu/vulnerabilities/l1tf + ignoreMissing: true + parse: + scalar: + regex: (\w+) + match: 1 +- name: cpu.vulnerability.l1tf_smt + filter: + fact: + name: os.kernel + value: Linux + value: + file: + path: /sys/devices/system/cpu/vulnerabilities/l1tf + ignoreMissing: true + parse: + scalar: + regex: SMT (\w+) + match: 1 +- name: cpu.vulnerability.unsafe + filter: + fact: + name: os.kernel + value: Linux + report: + message: CPU hardware vulnerability mitigation + pass: false + value: + bool: + any: + expressions: + - fact: + name: cpu.vulnerability.meltdown + value: Vulnerable + - fact: + name: cpu.vulnerability.spectre_v1 + value: Vulnerable + - fact: + name: cpu.vulnerability.spectre_v2 + value: Vulnerable + - fact: + name: cpu.vulnerability.spec_store_bypass + value: Vulnerable + - fact: + name: cpu.vulnerability.mds + value: Vulnerable + - fact: + name: cpu.vulnerability.l1tf + value: Vulnerable +- name: cpu.vulnerability.unsafe_smt + filter: + all: + expressions: + - fact: + name: os.kernel + value: Linux + - fact: + name: cpu.vendor.intel + value: "true" + - fact: + name: cpu.virt.present + value: "true" + report: + message: CPU hardware vulnerability SMT safety + pass: false + value: + bool: + any: + expressions: + - fact: + name: cpu.vulnerability.mds_smt + value: vulnerable + - fact: + name: cpu.vulnerability.l1tf_smt + value: vulnerable -- 2.21.0